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A conductometric study of complexation reaction between dibenzo-24-crown-8 with yttrium cation in some binary mixed non-aqueous solvents

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Abstract

The complexation reaction of macrocyclic ligand, dibenzo-24-crown-8 (DB24C8) with Y+3 cation was studied in some binary mixtures of methanol (MeOH), ethanol (EtOH), acetonitrile (AN) and tetrahydrofuran (THF) with dimethylformamide (DMF) at different temperatures using the conductometric method. The conductance data show that in all solvent systems, the stoichiometry of the complex formed between DB24C8 and Y+3 cation is 1:1 (ML). The stability order of (DB24C8.Y)+3 complex in pure non-aqueous solvents was found to be: AN > EtOH > MeOH > DMF. A non-linear behaviour was observed for changes of log Kf of (DB24C8.Y)+3 complex versus the composition of the binary mixed solvents, which was explained in terms of solvent–solvent interactions and also the heteroselective solvation of the species involved in the complexation reaction. The obtained results show that the stability of (DB24C8.Y)+3 complex is sensitive to the mixed solvents composition. The values of thermodynamic parameters (∆H°c and ∆S°c) for formation of (DB24C8.Y)+3 complex were obtained from temperature dependence of the stability constant using the van’t Hoff plots. The results show that in most cases, the (DB24C8.Y)+3 complex is enthalpy destabilized but entropy stabilized and the values and also the sign of thermodynamic parameters are influenced by the nature and composition of the mixed solvents.

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Acknowledgements

We gratefully acknowledge the support of this work by Islamic Azad University, Mashhad Branch, Iran.

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  1. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran

    Gholam Hossein Rounaghi, Somayeh Tarahomi & Massoumeh Mohajeri

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  1. Gholam Hossein Rounaghi
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  2. Somayeh Tarahomi
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Correspondence to Gholam Hossein Rounaghi.

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Rounaghi, G.H., Tarahomi, S. & Mohajeri, M. A conductometric study of complexation reaction between dibenzo-24-crown-8 with yttrium cation in some binary mixed non-aqueous solvents. J Incl Phenom Macrocycl Chem 63, 319–325 (2009). https://doi.org/10.1007/s10847-008-9525-2

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